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Given that the molecular mass of iron is 56 and that of oxygen is 16,...

Chemistry
JAMB 1985
Given that the molecular mass of iron is 56 and that of oxygen is 16, how many moles of iron(iii)oxide will be contained in 1kg of the compound?
  • A. 25.0 moles
  • B. 12.5 moless
  • C. 6.25 moles
  • D. 3.125 moles
  • E. 0.625 moles
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Correct Answer: Option C
Explanation
Fe2O3 = 56 x 2 + 48 = 160 = 1 moles

1000gm will contain \(\frac{1000}{160}\) = 6.25 moles
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Project Topics and Materials, Post-UTME past questions - Download now or upload yours to get paid
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Project Topics and Materials, Post-UTME past questions - Download now or upload yours to get paid
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Join your school's WhatsApp group
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Join your school's WhatsApp group
Project Topics and Materials, Post-UTME past questions - Download now or upload yours to get paid
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts